Dental instrument



T F. VOGELZANG.

DENTAL INSTRUMENT.

APELICATION FILED AUG.6, |920.

1,378,433. T Patented'May 17,1921.

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lF. VOGEL-ZANG.' DENTAL INSTRUMENT. APPLICATION FILED AUG6| 1920.

Patented May 17, 1921.

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` any great amount of pain.

.i UNITED s'rarss PATENT "'oFFicE.

FRANK voGELzANor' Roux. VALLEY, Iowa.' l

v DENTAL INSTRUMENT.

T o all whom it may concern.'

Be it known that I, FRANK VOGELZANG, a citizen of the United States, and a resident of Rock Valley, in the county of Sioux and State of Iowa, have invented a certain new and useful Dental Instrument, of which the following is a specification.

4The object of my invention is to provide a dental instrument,whereby a tooth having several roots, which are embedded in the gums may be cut apart for easy extraction, the device being of simple, durable and inexpensive construction.

Still a further object is to provide in such a device, a tooth engaging member and a saw blade capable of being moved to vari.- ous positions and adapted to saw thev tooth in two, whereby each part may be extracted separately, thus preventing the roots from causing soreness to the gums.

It will be understood that with the ordinary 4forceps when teeth are extracted, which have roots substantially as shown in Figure 1 of the drawings, it causes a great amount of pain, .due to the pulling upwardly of the roots. By my device, the tooth is first gripped by theforceps and then the saw or cuttingmechanism is moved to position directly above the tooth and then lowered until the saw engages the tooth, whereby lit will cause the tooth'to be severed lor cut in two, thus making it possible to easily extract Veach portion of they tooth without Still a further object 's to provide in such a device, in combination with a pair of forceps and a cutting blade-mechanism,

which is longitudinally adjustable `and alsoL verticallyV adjustable, whereby the device may be used upon teeth of various sizesv or in various positions.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of the device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims,

l and illustrated in the' accompanying drawi ings, inwhich:

' Fig. 1 shows a side elevation of my device, as applied` to the tooth, the cutting mechanism being shown in' dottedl lines in its lowered position. Y Fig. 2 shows a top view of the same.

Specication of Letters Patent. .Y

Fig. 3 shows a detail view of the forceps and the bar on which thel cutting mecha'- nism is slid. f l

Fig. 4 shows aI central, sectional view taken through the drive shaft, showing the flexible kdriving mechanism.

Fig. 5 showsA a central, sectional view taken on line 5-5 of Fig( 1, showing the means for transmitting vpower from the Hexible shaft to the cuttingV saw blade.

Fig. 6 shows a detail view of the locking device for holding the forceps fixed to a tooth. j

Fig. -7 shows va'l horizontal, central, sectional view, taken on the line 7-7 of Fig.- 1.

Fig. 8 shows a side elevation of the cutting blade, the casing 'or guard being re-,A moved3-andv f i F ig.` 9 is a Yfront elevation showing the inanrlier in which the device is vapplied to a' toot.w"' l yIn thev accompanying drawings, yIhave j Patented May 17,1921. Application filed August 6, 1920. Serial No. 401,700.

The forcepts 10 are pivoted atliy and arev providedl with the handle members l15 and 16. Pivoted to the handleV member -15 is the link 17, which is provided Vwith notches 18. The notches .18 arereceived between the .ups wardly extending lugs 19, holding the'handle members against any `movement relative to' each other. i

The tooth engaging members 12 are placed around the tooth, vas illustrated in Fig. 9, and then the handle members 15 and 16 `are tightened as much as possible by the operaV tor, then the link 17 is moved to position where the notches 18 will register with the lugs 19, thus holding the toothfengaging members postively fixed to the tooth 13.

Fixed to the pivot 14 and extending rear-5 wardly therefrom vis the narrow arm 2O on which isL fixed the guide device 21, which is provided with inclined sides 22.1 Slidably mounted on the guide devices 21 is the sup-A porting member 23, which 'is provided `with ribs 24 along each of its sides. The ribs 24 areinclined, so as to receive the correspond'- ingly inclined sides'of the slidable lmember 25,'.which is mounted on the support 23.-

jacent to the opening 26'of the slidable member is the vertical flange v27,#which is provided with the guide portions 28.

Slidably mounted within the guide portions 28 is the adjustable member 29, which has fixed to it a pair of rearwardlyextending arms V30, in which is journaled the vertical shaft. 31. Fixed to the. upper Send of the vertical shaft 31` is the beveledgear 32,

.which is in lmesh with the Vbeveled'gear 33.

The lower end of the shaft 31 is provided with a beveled gear 34, which is in :mesh with the beveled gear 35 on the shaft 36.

Theshaft 36 has one of its ends fixed to theV beveled gear 35, and is extended through the elongated slot 37 in the frame member 27.

The free end of the shaft 36 has fixed to it, the cutting or saw blade 38. A casing 39 is provided,\vhich has its lowerend open, which substantially covers the vblade 38 and is fixed to the frame 27 by means of the rivets 407 which vextend into the openings 41 of the frame 27.

Fixed tothe slidable member 25 adjacent to the ribs 24k are the four hollow up-right posts 42, which are connected together by meansof the bar 43, which hasits extreme forward end fixed to the framc27.v Each of the hollow posts 42V is provided on its inner adjacent surfaces with a slot 44.

Y Received within the hollow posts; 42 are Vthe springs45 extended Vacross the slidable member 25 and received within the slots 44 of the posts 42 are the cross pieces46, which are held in the upper `portion within the slots-44 by means of the springs 45.

' '5 In order toV limit the upward movement of the cross-pieces 46, the pins 47are provided within the posts 42 for that purpose.

. The cross pieces 46 have formed intermediate of their ends, theenlarged or bearing portion '43, in which is mounted the hollow casing 49. Within the casing 49 is the maino'perating or drive shaft 50, which is fixed to the beveled gear 33.

Extending rearwardly from the casing 49 is the ordinary flexible casing 51, which is v Y provided. with the flexible shafting52, which is of the ordinary type.

In order to hold the Yflexible casing 51 to the casing 49, I have provided the hook member 53, which has one end received within an opening within: the casing 49 and its otherv end received withinV the flexible casing 51.VK

The flexible shafting 52 is fixed to any suitable source of energy, whereby the shaft 50 may be rotated. The rotation of the shaft 50 imparts rotation to the vertical shaft 30 through the beveled gears 32 and 33. Rotation isimparted to theshaft 36 from the vertical sha-ftV 30 by means of the beveled gears 34 and 35, thus imparting rotary movement to the saw blade 38.

Fixed to the casing 49 and between the j cross pieces 46 is the thumb rest 54, the purpose vof which will be hereinafter more fully y set forth.

When the operator handles the device, he engages the handle members 15 and 16 with the palm `and fingers of his hand and-places his thumb upon the thumb rest 54. It will ward ends fixed tothe adjustable member 29, which is capable of verticaladjustment or movement.-

It rwill be understood that when the operator desires to move the cutting. mechanism downwardly or into operative position', as is shown in dotted-lines in Fig. 1 of the drawings, pressure is exertedon the/thumb rest 54, which will cause the parts tov move downwardly, the bowed arms 55' causing the vertical adjustable member 29 to move downwardly, thus carrying with it the entire cutting mechanism.

It will be seen that longitudinal movement of theV cutting mechanism relative to the forceps is permitted by means of the guides 22 Vand the slidable members 25.

This makes-it possible to move my device longitudinally and adjust it, sothat the cutting blade may be placed directly above the tooth desired to be extracted.

sc be understood that-the springs 45 within When the cutting blade is in this position,

then by vexerting pressure to the thumb 'rest 54, the parts are moved downwardly, so that the rotating cutter blade will cutthe tooth into several parts. When the tooth is cut in several parts,it is then easy to extract each portion separately, even though the roots are of the curved type, substantiall as is illustrated in Fig. l of the drawings.

The advantages of my device are that I am able to quickly and readily adjust the saw` blade, so that it will center directly above the tooth desired'to be extracted, or it may be moved to inoperative position by releasing the pressure on the springs 45 and then sliding the entire cutting mechanism on the guide 22. Y

It will be understood that themember 23 may slide on the guide device 22, while the slidable member 25 may slide upon the member 23. This gives me a ner degree of adjustment or movement, so thatthe device may be moved and used upon teeth in various positions. l

By providing the casing 39, I am able to prevent the saw blade from coming in contact with the patients mouth and causing any seriousinjury.

The members l2 are also curved in such a manner that they will form a sort of shield while cutting the tooth, being so arranged that the saw will pass between the upper ends of said members.

The shoulders l1 of the members 12 are so A arranged that they will engage the sides of the tooth while the points 11a will enter between the roots and beneath the crown portion of the tooth, thereby forming a very rigid and eective clamp whereby the saw mechanism may be held steady while in operation.

Some changes may be made in the construction and arrangement of the different parts of my improved device, without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope.

I claim as my invention:

l. -In a device of the class described, in combination with a pair of forceps, adapted to engage a tooth, a tooth cutting blade capable of vertical movement, means for imparting rotary movement to said blade, and means whereby said blade may be moved to inoperative position away from the tooth.

2. In a device of the lclass described, in combination with a pair of forceps, adapted to engage a tooth, a tooth cutting blade capable of vertical movement, means for yieldingly holding the blade at one limit of its vertical movement, means for imparting rotary movement to said blade, and means whereby said blade may be moved tov inoperative position away from the tooth.

3. In a device of the class described, a tooth engaging member having a frame fixed thereto, an auxiliary frame slidably mounted thereon, a cutting blade on said auxiliary frame and capable of vertical movement relative to said auxiliary frame and adapted to slide therewith, means for yieldingly holding said blade at kone limit of its vertical movement, and means for moving the blade to cutting position.

Des Moines, Iowa, Junev7, 1920.

FRANK voGELzANG. 

